Xcode 7：为iPhone 6S plus的CollectionView设置顶部约束

Question

I want to set different constraints based on device type. The constraint is to be set b/w CollectionView and Label (Username)

For eg. iPhone 4 will have top: 2 left: 0 right: 0 and bottom:0

whereas iPhone 6S Plus will have top: 15 left: 0 right: 0 and bottom:0

How can this be set in Storyboard?

Answer 1

you can create an outlet for the top constraint and change the value in code

@property (weak, nonatomic) IBOutlet NSLayoutConstraint    
                                    *collectionViewTopSpaceConstraint;

-(void)viewDidLoad
{
    [super viewDidLoad];

    //iPhone 6 plus
    if(CGRectGetHeight(self.view.frame) == 736.0)
    {
       self.collectionViewTopSpaceConstraint.constant = 10; // some constant
    }



}